1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
20
21 3GPP TS 26.073
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
24
25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26 Permission to distribute, modify and use this file under the standard license
27 terms listed above has been obtained from the copyright holder.
28 ****************************************************************************************/
29 /*
30 ------------------------------------------------------------------------------
31 INPUT AND OUTPUT DEFINITIONS
32
33 Inputs:
34 L_var1 = 32 bit long signed integer (Word32) whose value falls
35 in the range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.
36
37 Local Stores/Buffers/Pointers Needed:
38 None
39
40 Global Stores/Buffers/Pointers Needed:
41 None
42
43 Outputs:
44 L_var1 = 32-bit negation of input
45
46 Pointers and Buffers Modified:
47 None
48
49 Local Stores Modified:
50 None
51
52 Global Stores Modified:
53 None
54
55 ------------------------------------------------------------------------------
56 FUNCTION DESCRIPTION
57
58 This function negates the 32 bit variable, L_var1, with saturation; saturate
59 in the case where input is -2147483648 (0x8000 0000).
60
61 ------------------------------------------------------------------------------
62 REQUIREMENTS
63
64 None
65
66 ------------------------------------------------------------------------------
67 REFERENCES
68
69 [1] basicop2.c, ETS Version 2.0.0, February 8, 1999
70
71 ------------------------------------------------------------------------------
72 PSEUDO-CODE
73
74 Word32 L_negate (Word32 L_var1)
75 {
76 Word32 L_var_out;
77
78 L_var_out = (L_var1 == MIN_32) ? MAX_32 : -L_var1;
79 #if (WMOPS)
80 multiCounter[currCounter].L_negate++;
81 #endif
82 return (L_var_out);
83 }
84
85 ------------------------------------------------------------------------------
86 RESOURCES USED
87 When the code is written for a specific target processor the
88 the resources used should be documented below.
89
90 STACK USAGE: [stack count for this module] + [variable to represent
91 stack usage for each subroutine called]
92
93 where: [stack usage variable] = stack usage for [subroutine
94 name] (see [filename].ext)
95
96 DATA MEMORY USED: x words
97
98 PROGRAM MEMORY USED: x words
99
100 CLOCK CYCLES: [cycle count equation for this module] + [variable
101 used to represent cycle count for each subroutine
102 called]
103
104 where: [cycle count variable] = cycle count for [subroutine
105 name] (see [filename].ext)
106
107 ------------------------------------------------------------------------------
108 */
109
110
111 /*----------------------------------------------------------------------------
112 ; INCLUDES
113 ----------------------------------------------------------------------------*/
114 #include "basic_op.h"
115
116 /*----------------------------------------------------------------------------
117 ; MACROS
118 ; Define module specific macros here
119 ----------------------------------------------------------------------------*/
120
121 /*----------------------------------------------------------------------------
122 ; DEFINES
123 ; Include all pre-processor statements here. Include conditional
124 ; compile variables also.
125 ----------------------------------------------------------------------------*/
126
127 /*----------------------------------------------------------------------------
128 ; LOCAL FUNCTION DEFINITIONS
129 ; Function Prototype declaration
130 ----------------------------------------------------------------------------*/
131
132 /*----------------------------------------------------------------------------
133 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
134 ; Variable declaration - defined here and used outside this module
135 ----------------------------------------------------------------------------*/
136
137 /*----------------------------------------------------------------------------
138 ; EXTERNAL FUNCTION REFERENCES
139 ; Declare functions defined elsewhere and referenced in this module
140 ----------------------------------------------------------------------------*/
141
142 /*----------------------------------------------------------------------------
143 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
144 ; Declare variables used in this module but defined elsewhere
145 ----------------------------------------------------------------------------*/
146
147 /*----------------------------------------------------------------------------
148 ; FUNCTION CODE
149 ----------------------------------------------------------------------------*/
L_negate(Word32 L_var1)150 Word32 L_negate(Word32 L_var1)
151 {
152 /*----------------------------------------------------------------------------
153 ; Define all local variables
154 ----------------------------------------------------------------------------*/
155
156 /*----------------------------------------------------------------------------
157 ; Function body here
158 ----------------------------------------------------------------------------*/
159 L_var1 = (L_var1 == MIN_32) ? MAX_32 : -L_var1;
160
161 /*----------------------------------------------------------------------------
162 ; Return nothing or data or data pointer
163 ----------------------------------------------------------------------------*/
164 return (L_var1);
165 }
166
167